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The fonds consists of material which documents Williamson's career as a fine arts bibliographer, librarian and instructor along with associated professional and scholarly activities. It includes correspondence and reports prepared for collection acquisitions (e.g. Germain Bazin library, archives and postcard collection), other library initiatives, interactions with various library departments, and departments in the Faculty of Fine Arts including visual arts, dance, and theatre; material related to her work on YUFA, PLAYU (Professional Librarians Association of York University), the Librarians' Group, and other York University and library committees; exhibition catalogues, monographs, articles and conference presentations authored by Williamson; and research materials, grant files and teaching files.The fonds also includes a collection of letters and photographs that Williamson sent home during her stay at various summer camps between 1940 and 1951, material related to the Moore Park Ratepayers' Association, and a collection that Williamson acquired consisting of 63 photocopied letters from literary and artistic figures in Canada such as Susanna Moodie and George Munro Grant, addressed to Louisa Murray (1818-1894), literary critic and writer on feminist issues.